I'm being ****med by Vodacom!!!

I'm very frustrated, I'm being ****med by Vodacom, my cellphone contract is supposed to end January, July I got a call saying the the package I selected has being cancelled so I have to choose another package I chose a lower cost package, turns out they have extended my contract till June next year, this is without my consent I wasn't told it will be extended. I am now paying more than I was paying, From R420pm to R970pm I mean what's that, please help I try calling but they don't answer my calls I went to the Vodacom store in Midrand they can't even explain this to me it's like the costs go up every time I enquire about this matter they have been saying they escalating my calls I don't know what to do. This is *****,